Term
1. Define and distinguish between the annual crop and inversity principles. What effect does harvest have on equilibrium density for each of the theories? |
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Definition
Annual Crop = Numbers produced in excess of winter threshold are surplus. May be harvested without affecting the long‐term density. Harvest mortality simply replaces natural mortality, and does not affect equilibrium (winter) density. Pertains only to seasonal harvest.
Inversity = • Inputs & outputs balance at certain population density (i.e., K) • Harvest will reduce density. Pertains to harvest all year. |
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Term
2. Describe and distinguish between compensatory and additive mortality. What role do thresholds play in distinguishing between compensatory and additive mortality? |
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Definition
Compensatory ‐ occurs when survival, reproduction or movement into the population increases because of the harvest of animals, thereby reducing the effects of harvest mortality on population growth.
Additive – occurs when harvest mortality adds to that of natural mortality
Hunting may be compensatory up to a certain threshold. Once exceeded, more hunting becomes additive. Challenge is to determine that threshold before setting harvest goals. |
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Term
3. What species characteristics tend to be correlated with a greater ability to compensate for harvest mortality? What characteristics are correlated with low capacity to compensate? |
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Definition
• Compensation greatest for species with higher background mortality – Short lifetimes & high reproduction • Compensation least for species with longer lifetimes & low reproduction |
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Term
4. Describe how harvest mortality (coyote control) is compensated for in populations of western coyotes. |
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Definition
– Larger litter sizes – Increased reproduction in yearlings – Increased juvenile survival – Increased immigration |
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Term
5. Describe the spatial harvest control method. Why is this method relatively ineffective in areas of fragmented habitat? |
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Definition
• Some areas closed to harvest to ensure abundant harvests in other areas: “refuges” • Adjusted movement rates among populations with and without harvest |
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Term
6. How is net reproductive value a useful concept in understanding the difference between the effects of harvest mortality and natural mortality on animal populations? |
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Definition
Less effect when harvesting animals are of low reproductive value – Hunters take cow elk with high reproductive value vs – Wolves take older cow elk & calves, both of lower reproductive value |
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Term
7. Explain how harvest mortality can result in genetic and resulting physical changes in animal populations. |
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Definition
Bighorn sheep trophy hunting in Alberta – For 30 years, any ram with a min legal horn size could be taken – Thus, hunters took rams that quickly grew big horns & body size, selecting 4‐8 years old – Thus, removing them from population before they could breed • Implemented “full‐curl” restriction – must extend beyond ram’s nose |
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Term
8. In the “Tale of Two Does” side bar of John McDonald’s article on “Deer Management in Massachusetts” how do environmental conditions affect each of the two does in the story and what are the implications of these effects for the demographic characteristics of deer populations in those two areas of the state? |
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Definition
Dover does are lower elevation than Savoy does so warmer climate, less snow, more abundant food, better food (gardening). Healthier does after winter are more likely to have twins or triplets so more deer in Dover than Savoy more people getting pissed. |
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Term
9. What are the deer management goals for MA? |
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Definition
Healthy, Balanced Deer Population }
Below Level where Major Impacts to Habitat/other Species are Seen }
Balance Social Desires and Tolerance ◦ Hunting/Viewing Opportunities ◦ Public Safety and Public Health ◦ Ag/Residential Property Damage |
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Term
12. What data are collected at a deer check station and how do deer managers use these data? |
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Definition
• Sex
• Age (fawns, yearlings, adult/age classes)
• Dressed body weight
• Antler beam diameter
• Others ‐ # corpora lutea scars, liver condition, adrenal weight, tick abundance,
• Est. total harvest • Est. total effort expended • Sex ratio of harvest • Sex‐specific age structure of harvest |
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Term
13. Why does The Nature Conservancy consider too many deer to be perhaps a bigger threat to Eastern forests than climate change? |
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Definition
More immediate, happens faster, eat everything, drive out other species. Risks to people collision, lyme. |
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Term
14. Identify the most serious challenges to maintaining deer density goals in Massachusetts. |
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Definition
Many interested parties with different goals. Success of hunter dependent. |
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Term
14. Identify the most serious challenges to maintaining deer density goals in Massachusetts. |
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Definition
Many interested parties with different goals. Success of hunter dependent. No other predators |
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Term
15. Be prepared to discuss the pros and cons of the 8 options for controlling deer populations as presented in the publication “An Evaluation of Deer Management Options” by Ellingwood and Caturano. |
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Definition
1. Hunting,
2. No management, starvation, (no predators)
3. Trap and Transfer, (expensive, where?),
4. Fences/Repellents (effort high, repellent only in no rain, expensive),
5. Birth Control (cost, non targets, logistics),
6. Feed them (pop still grows),
7. Sharpshooters (cost, no $ from hunters),
8. Predators (variable, too many people). |
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Term
17. Describe the special problems associated with furbearer management. |
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Definition
Traps controversial , varying effectiveness (by-catch), and demand not constant (tied to market for pelts). |
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Term
18. Describe the four types of traps used for trapping furbearers. |
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Definition
Foot holds (non-lethal, cruel?, most common),
Conibear (lethal, second common) ,
snares (lethal, 3rd common),
others (cage based, time senisitive but non lethal, least common). |
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Term
19. Describe the characteristics that are used to evaluate traps? |
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Definition
Effectiveness – trap’s ability to adequately hold or kill a captured animal – usually measured as number of captures/100 trap nights – unpadded (73%) vs. padded (50%) foot‐hold traps for coyotes – greatly affected by trapper experience.
Selectivity – extent that traps capture “wanted” vs. ‘Unwanted” species Factors affecting unwanted capture rates • trap type & trap site • type of set & bait used • time of year & trapper technique Highly variable ranging from no unwanted animals to 2 unwanted animals per wanted furbearer caught |
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Term
20. How can injury from traps be reduced? |
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Definition
Efforts to reduce injuries – use of smaller traps – daily, early morning checks of traps – tranquilizer tabs – padded traps. |
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Term
21. What is pelt sealing and why is it useful? |
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Definition
Mandatory tagging of pelts by state – Provides more accurate harvest information – Reduces bias in reporting process – Very costly logistically, so few states do it |
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Term
22. Does this graph of furbearer harvest tell you about the status of the two furbearer populations? |
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Definition
Not Much! • Trapper effort • Pelt prices • Number of trappers |
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Term
23. Why is it so important to have data on trapping effort to go along with data on the number of animals harvested each year? |
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Definition
Because effort is variable due to market changes. So If effort high but catch low means different than effort low catch low. |
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Term
24. Other than population abundance what demographic characteristics of black bears are monitored in Massachusetts? What demographic characteristic of black bear populations has the most impact on population growth? |
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Definition
Adult survival rates • Adult female survival rates have most impact on population
Age at first reproduction
Average litter size • 1st litters vs subsequent
Cub survival • 1st litters vs subsequent litters |
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Term
25. Other than population abundance what other aspects are considered when deciding how to manage bear populations in MA? |
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Definition
• Hunter/trapper satisfaction and ability • Habitat suitability or management • Public complaints • Vehicle collisions • Public perception of the population • Public perception of management options |
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Term
26. Describe the recovery of beaver populations in MA from 1928 to the present (as described in the article by Langlois and lecture in class). |
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Definition
Elminiated form MA by hunting/habitat loss, then reappeared in 1928, people pumped about it. Then no predators (wolves) or diseases, or competition so they exploded. People pissed, hunting/exclosure sound good again. |
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Term
27. What was Question 1, and what effect did it have on trapping furbearers in Massachusetts? |
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Definition
Question 1 – “Wildlife Protection Act • Banned use of footholds and body-gripping traps • Dramatic drop in beaver harvest – dramatic increase in population.
Limited most effective way of pop control and study conducting. |
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Term
28. How do the U.S. Fish & Wildlife Service and Canadian Wildlife Service estimate waterfowl abundance? |
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Definition
Waterfowl Breeding Population & Habitat Surveys : • Conducted in May and June • Aerial surveys along transects with a sample of ground/helicopters counts to estimate visibility bias • Count number of ducks and ponds
Production & Habitat Surveys: • Conducted in July • Aerial & ground surveys (not concurrent) • Only a portion of strata surveyed • Number of duck broods (brood index) & number of ponds |
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Term
30. How does the USFWS determine how many waterfowl were harvested? |
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Definition
Annual Waterfowl Harvest Surveys – (2 parts)
Part I. HIP Harvest Information Program FWS selects a random sample of migratory bird hunters & asks them for information – Kind and number of migratory birds hunted – Used to estimate total harvest.
Part II: Cooperative Parts Collection Survey Sample of successful hunters asked to mail in 1 wing from each duck & tail from each goose harvested |
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Term
31. Explain how the Migratory Bird Treaty Act structures how the U.S. government regulates waterfowl harvests? |
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Definition
• MBTA made it unlawful to hunt, kill, or possess migratory birds except as permitted by regulations set by the Secretary of the Interior.
• MBTA authorizes the Secretary to determine when, if at all, to allow the hunting of birds. SEASON IS CLOSED UNTIL OPENED
• MBTA does not prohibit States from making or enforcing regulations, provided such regulations are not more liberal than those approved by the Secretary |
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Term
32. Identify and briefly discuss the two categories of annual regulations for waterfowl management. |
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Definition
Framework Regulations:
• Framework Dates - Set for each flyway & states select dates within framework when waterfowl most abundant
• Season Length – May not exceed 107 days for migratory birds
• Daily Bag Limit – varies by flyway & highly variable in response to population estimates
• Shooting Hours – ½ hr before sunrise to sunset
• Season length & bag limits – cornerstones for managing harvest of migratory birds
Special Regulations :
• Zoning & Split Seasons • Closed seasons for low abundance species (e.g. harlequin duck) • Special Seasons – focus on under‐harvested species or opportunities for special user groups • Quotas also used for limited resources (e.g. some Canada goose & sandhill cranes populations) |
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Term
33. What is the mallard fall flight index and what goes into estimating it? |
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Definition
• Estimated size of mid‐continent mallard population (traditional survey area + MI, MN, &WI) for the fall migration
• Calculated based on: – Breeding population size – Habitat conditions – Adult summer survival – Projected fall age ratio (young/adult) |
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Term
34. Briefly discuss what types of activities/parameters are managed/controlled by the framework regulations. |
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Definition
When (time, dates) and amount (bag limit). |
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Term
35. Describe Adaptive Harvest Management and why it was developed. |
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Definition
Goal: “Adaptive harvest management describes the ability to make a sequence of decisions, in the face of uncertainty, that is optimal with respect to a stated objective, recognizing some constraints" (D. R. Anderson) • Managing in the face of uncertainty with a focus on its reduction. |
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Term
36. Identify the four steps in the Adaptive Management Feedback Loop? |
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Definition
• Monitor – Estimate resource status
• Learn (reduction in structural uncertainty) – Compare predictions to estimates – Update model weights
• Predict (Structural Models) – Model‐specific predictions of effects of management given resource status
• Manage – Implement management alternative maximizing objective(s) based on resource status and model weights |
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Term
37. What are the “key components” of Adaptive Harvest Management? |
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Definition
• Limited number of regulatory alternatives (flyway specific season lengths, bag limits, framework dates)
• Set of population models describing various hypotheses about effects of harvest & the environment on waterfowl abundance
• Measure of reliability for each population model (weights)
• Mathematical description of the harvest management objectives by which harvest strategies can be evaluated |
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Term
38. Discuss the sources of uncertainty that affect Adaptive Harvest Management for waterfowl. |
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Definition
• Environmental Stochasticity ₋ e.g., weather, habitat
• Partial Observability ₋ Uncertainty about population status
• Partial Controllability ₋ Decisions only partially control actual magnitude of actions
• Structural Uncertainty ₋ Relationship between management action and population status/response |
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Term
39. What key variables are used by the USFWS to determine the optimum harvest strategy for midcontinent mallards? |
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Definition
Harvest strategy derived using combinations of: – Breeding population size – Environmental conditions – Model weights Assesses which model best describes the dynamics of the managed populations. |
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Term
40. Briefly identify the four AHM models that are tested for waterfowl abundance and harvest. |
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Definition
• 4 models of population dynamics – Mortality: Additive vs. compensatory – Reproduction: Strong vs. weak density dependence |
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Term
42. What is ‘probability of detection’ and how is it used in distance sampling methodologies? |
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Definition
Probability of detecting an animal, given that it is at a distance x from the line. Assumes animals closest to line are more likely to be detected. |
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Term
43. What are the assumptions for distance sampling methods? |
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Definition
• Lines are randomly located in the study area
• Animals on the line are certain to be detected [g(0) = 1]
• Detected animals do not move in response to the observer before detection
• Distances are recorded without error
• Detection curve has a ‘shoulder’
• Detections are independent events
• Animals are counted only once from a single line |
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Term
44. If census techniques yield better estimates of elephant abundance why would wildlife agencies consider using strip (fixed-width) or distance sampling instead? |
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Definition
Easier, cheaper, quicker, etc. |
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Term
45. What is statistical ‘power’ and why is it an important concept for the conservation of wildlife populations? |
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Definition
The probability that a test correctly rejects the null hypothesis. 1- # of type II errors. How good is your monitoring really at being right? |
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Term
46. What are the assumptions of the Leslie Method for Catch-per-unit-effort (CPUE) estimating of wildlife population abundance or density? |
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Definition
• Closed population
• Probability of capture is equal
• Probability of capture is linearly proportional to the effort extended for the sample |
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Term
47. Explain what statistical function is used to estimate population abundance using the removal (CPUE) method. |
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Definition
• The simultaneous analysis of 2 or more variables
• Estimate the relationship of one variable with another in terms of a function
• To predict values of one variable in terms of the other |
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Term
48. What are some situations where the removal (CPUE) method would be a good option for estimating abundance? |
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Definition
Leslie – linear relation between CPUE and Nt • Used when a significant proportion of population is removed
DeLury – non‐linear relation between CPUE and Nt • Used when the proportion of the population taken by a unit of effort is small (i.e. 0.02) |
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Term
49. What is Strategic Habitat Conservation? |
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Definition
1. A structured way to critically thinking about what we do and why we do it; or
2. Setting explicit objectives for populations and then systematically figuring out how to achieve them most efficiently using our own resources and by working with partners. |
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Term
50. Explain why the USFWS and USGS adopted the Strategic Habitat Conservation approach to get away from “…grabbing the low hanging fruit.” |
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Definition
Could happen cause: • Advancements in conservation theory • Geospatial technologies • Increasing emphasis on accountability Increasing the effectiveness & efficiency of achieving conservation objectives
Did happen cause: • A shift in the overarching aim of conservation to system sustainability
• A shift in emphasis from the project scale to the landscape scale
• More science‐intensive approaches to planning – Model‐based – Spatially explicit – Predictive – Outcome‐based vs. activity‐based goals and objectives
• An ever‐increasing emphasis on biological accountability • An emerging emphasis on socially viable solutions (socio‐ ecological sustainability) |
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Term
51. List and briefly describe the functional elements of Strategic Habitat Conservation |
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Definition
• Biological planning
• Conservation design
• Conservation delivery
• Decision‐based monitoring
• Assumption‐driven research |
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Term
52. Explain the difference between “activity-based” and “mission-oriented” conservation objectives and provide an example of each. |
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Definition
Example: activity-based objectives (Focused on actual numbers, precise) - Protect and restore 20,000 acres of bottomland hardwoods in the Mississippi Alluvial Valley
Example: mission-oriented objectives (Overarching) - Reestablish and maintain three viable sub‐populations of LA Black Bear in the Tensas Basin, Red River Backwater, and Atchafalaya Basin of Louisiana. |
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Term
53. What are the benefits of Strategic Habitat Conservation? |
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Definition
• Better communication among programs and externally
• Records of decisions
• More credibility
• Greater efficiency
• Greater capacity for leadership in conservation community
• Strategic research and monitoring
• Accountability |
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Term
54. Define “biodiversity” and describe the three levels of biodiversity (not to be confused with the three types of diversity). |
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Definition
“Is the variety of life and its processes; and includes the variety of living organisms, the genetic differences among them, and the communities and ecosystems in which they occur.” |
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Term
55. Explain how human biology can get in the way of rational decision-making about species conservation. |
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Definition
We like things that are big and look like babies, but are less driven to help small, not cute things no matter how important they are ecologically. |
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Term
56. Give four examples of how biodiversity is linked to human welfare. |
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Definition
Penicillin, disease tolerant rice species, spider goats, horseshoe crab blood in endotoxin testing makes things safer. |
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